An evaluation of articulatory working space area in vowel production of adults with Down syndrome

Bunton, Kate; Leddy, Mark

doi:10.3109/02699206.2010.535647

Cited by 58 publications

(38 citation statements)

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“…For example, longer vowel durations relative to healthy controls were reported for individuals with Down and Williams syndromes (Bunton & Leady, 2011; Setter et al, 2007) and significant deviations from the typical durations were found in individuals with dysarthria (Liss et al, 2009). Vowel durations for adults with Amyotrophic Lateral Sclerosis (ALS) and spastic dysarthria were again significantly longer than controls (Caruso & Burton, 1987; Turner, Tjaden, & Weismer, 1995).…”

Section: Introductionmentioning

confidence: 99%

Variation in Vowel Duration Among Southern African American English Speakers

Holt

Jacewicz

Fox

2015

Am J Speech Lang Pathol

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Purpose Atypical duration of speech segments can signal a speech disorder. This study examined variation in vowel duration in African American English (AAE) relative to White American English (WAE) speakers living in the same dialect region in the South in order to characterize the nature of systematic variation between the two groups. The goal was to establish whether segmental durations in minority populations differ from the well-established patterns in mainstream populations. Method Participants were 32 AAE and 32 WAE speakers differing in age who, in their childhood, attended either segregated (older speakers) or integrated (younger speakers) public schools. Speech materials consisted of 14 vowels produced in hVd-frame. Results AAE vowels were significantly longer than WAE vowels. Vowel duration did not differ as a function of age. The temporal tense-lax contrast was minimized for AAE relative to WAE. Female vowels were significantly longer than male vowels for both AAE and WAE. Conclusions African Americans should be expected to produce longer vowels relative to White speakers in a common geographic area. These longer durations are not deviant but represent a typical feature of AAE. This finding has clinical importance in guiding assessments of speech disorders in AAE speakers.

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Section: Introductionmentioning

confidence: 99%

Variation in Vowel Duration Among Southern African American English Speakers

Holt

Jacewicz

Fox

2015

Am J Speech Lang Pathol

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“…2 VSA estimates, based on either three (VSA3) or four vowel-systems (VSA4), have formed the basis of many studies investigating the reduction of articulation in patient groups due to a specific condition, or the restoration of articulatory range as a result of treatment. [2][3][4][5][6][7][8][9][10] The results have, however, been variable in terms of articulatory change shown by the VSA metric, with reductions in VSA at times failing to reach significance in cases where a consistent trend of articulatory reduction is observed [11][12][13] (see Sapir et al 9 for a review). In an attempt to address the observed lack of power in the VSA measure, a reorganization of the formant frequency values has been proposed to form a quotient of formant frequency sums into a formant centralization ratio (FCR), so that "the formant frequencies in the numerator are likely to increase, and the formant frequencies in the denominator are likely to decrease with vowel centralization."…”

Section: Introductionmentioning

confidence: 99%

Vowel formant dispersion as a measure of articulation proficiency

Karlsson

Doorn

2012

The Journal of the Acoustical Society of America

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The articulatory range of a speaker has previously been estimated by the shape formed by first and second formant measurements of produced vowels. In a majority of the currently available metrics, formant frequency measurements are reduced to a single estimate for a condition, which has adverse consequences for subsequent statistical testing. Other metrics provide estimates of size of vowel articulation changes only, and do not provide a method for studying the direction of the change. This paper proposes an alternative approach. Vowel formant frequencies are redefined as vectors originating from a defined center point of the vowel space fixed to a basic three-vowel frame. The Euclidean length of the vectors, the vowel formant dispersion (VFD), can be compared across conditions for evidence of articulatory expansions or reductions across conditions or speaker groups. Further, the angle component of the vowel vectors allows for analyses of direction of the reduction or expansion. Based on the range of investigations afforded by the VFD metric, and simulation experiments that compare its statistical properties with those of other proposed metrics, it is argued that the VFD procedure offers an enhanced view of vowel articulation change over rival metrics.

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“…A review of studies of articulatory and phonological development in children with DS illustrates that phonological development is both delayed and disordered. Speech sounds develop slowly and error patterns can be related to anatomical differences (Bunton & Leddy, 2011 ). There is a lack of articulatory precision, pausing and phrasing, as well as a reduction of consonant clusters and fi nal consonants overall (Kent & Vorperian, 2013 ).…”

Section: Slps' Role For Children With Down Syndrome Slp's Supports mentioning

confidence: 99%